连续刚构桥跨中置换混凝土加固技术研究

Research on the Strengthening Technology of Replacing Concrete in Mid-span of the Continuous Rigid Frame Bridge

针对连续刚构桥跨中合龙段混凝土出现分层起壳现象的罕见病害,通过对全桥结构分析计算和对中跨跨中的局部结构分析计算,提出了跨中置换混凝土并施加体外预应力的创造性加固方法;并介绍了适应该加固法的高压水射流凿除混凝土的施工工艺,通过对施工和荷载试验全程跟踪监控得出的数据,说明该加固法的良好加固效果和简易的可操作性。为出现类似病害的桥梁提供了一种具有普遍推广性的加固方法,为高压水射流先进施工工艺的推广提供了宝贵的经验。

The closure section concrete has lamination phenomenon in mid-span of the continuous rigid frame bridge. Aiming at this rare disease, through the calculation and analysis of the entire bridge structure and the mid-span cross partial structure, the creative reinforcement method of replacing concrete with externally applied pretressing is proposed; the ad- vanced construction technology of eliminating concrete by high-pressured water jet chisel is also introduced. Furthermore, through analyzing the data obtained by all-the-way tracking monitoring the construction and the load experiments, it is showed that the strengthening technology is effective and feasible in construction. This strengthening technology offers a universal method to the bridges which occur similar disease, and it also offers precious experience to the popularization of the advanced construction technology of high-pressured water jet chisel.